101 Extensor indicis
![](img/model2/no_101forearm.png)
Origin:
Posterior surface of distal third of ulna and interosseous membrane
Insertion:
Extensor expansion of 2nd digit
Blood Supply:
Posterior interosseous artery
Innervation:
Posterior interosseous nerve (C7, C8), continuation of deep branch of radial nerve
Main Action:
Extends 2nd digit (enabling its independent extension); helps extend hand at wrist